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comp.lang.ruby

Re: DateTime.strptime

Morton Goldberg

12/14/2006 4:44:00 AM

On Dec 13, 2006, at 7:03 PM, Matt G. wrote:

> Sorry for posting a beginner question here, but it seems like date/
> format.rb
> is missing documentation on ruby-doc.org.
>
> So, the question is, why does this code not work? (I'm using
> ruby-1.8.4)
>
> irb(main):001:0> require 'date'
> => true
> irb(main):002:0> myd = DateTime.strptime("1166049481", '%s')
> ArgumentError: 3 elements of civil date are necessary
> from lib/ruby/1.8/date.rb:1214:in `new_with_hash'
> from lib/ruby/1.8/date.rb:1238:in `strptime'
> from (irb):2
>
> I was able to make this work: Date::strptime("1/1/1970", '%d/%m/%
> Y') so I'm
> pretty sure I don't have a syntax error.

DateTime.strptime simply can't handle "1166049481" as an argument. It
wants something that looks like a date/time stamp that a human might
be able to read. Unfortunately, as you point out, exactly what it
wants isn't documented. You're expected to read date/format.rb, which
IMO isn't easy decipher.

BTW, even if your first argument were acceptable, I think your second
would be ignored -- at least in 1.8.2, which is what I'm running, %s
has no effect.

> Thanks for any help.

Not much help, I'm afraid, but you did ask for "any help" :)

Regards, Morton
1 Answer

George

12/15/2006 2:46:00 AM

0

On 12/14/06, Matt G. <mattismyname@gmail.com> wrote:
> Thanks Morton. I did read date/format.rb and in 1.8.4 (what I'm running) it
> supports the %s format which I believe is supposed to represent the number
> of seconds since 1/1/1970. The number I'm passing in represents the number
> of seconds since 1/1/1970.

It looks like a bug in date/format.rb to me. It also works as you
expect in 1.9. Try this patch:



--- format.rb.orig 2006-12-14 17:48:54.000000000 +1100
+++ format.rb 2006-12-15 13:35:23.000000000 +1100
@@ -1,6 +1,7 @@
# format.rb: Written by Tadayoshi Funaba 1999-2005
# $Id: format.rb,v 2.15 2005-02-06 13:28:48+09 tadf Exp $

+require 'time'
require 'rational'

class Date
@@ -138,8 +139,14 @@
elem[:sec] = val
when '%s'
return unless str.sub!(/\A(\d+)/o, '')
- val = $1.to_i
- elem[:seconds] = val
+ time = Time.at($1.to_i)
+ elem[:year] = time.year
+ elem[:mon] = time.mon
+ elem[:mday] = time.mday
+ elem[:hour] = time.hour
+ elem[:min] = time.min
+ elem[:sec] = time.sec
+ elem[:offset] = time.utc_offset
when '%T'
return unless __strptime(str, '%H:%M:%S', elem)
when '%t'